selftests/bpf: Test passing rdonly mem to global func

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Add two test cases, one pass read only map value pointer to global
func, which should be rejected. The same code checks it for kfunc, so
that is covered as well. Second one tries to use the missing check for
PTR_TO_MEM's MEM_RDONLY flag and tries to write to a read only memory
pointer. Without prior patches, both of these tests fail.

Reviewed-by: Hao Luo <haoluo@google.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20220319080827.73251-5-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Kumar Kartikeya Dwivedi 2022-03-19 13:38:26 +05:30 • committed by Alexei Starovoitov

parent 7b3552d3f9

commit 7cb29b1c99

4 changed files with 46 additions and 6 deletions

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17

tools/testing/selftests/bpf/prog_tests/ksyms_btf.c

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1

tools/testing/selftests/bpf/prog_tests/test_global_funcs.c

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16

tools/testing/selftests/bpf/progs/test_global_func17.c

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18

tools/testing/selftests/bpf/progs/test_ksyms_btf_write_check.c

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